Given:
Comprehensive deductible - 375
Collision deductible - 550
Premium for 4 months = 625
Body shop estimate on car damages - 650
Valerie's accident will fall under the collision insurance. Collision includes crashing into other cars or stationary objects. In this case, Valerie collided into a dumpster.
The damage of 650 will be paid by Valeria and ABC Insurance. Valerie will pay 550, the equivalent of her collision deductible, and ABC Insurance will pay for the remaining 100.
We can use substitution to insert one equation into the other
so then it's -2x+(-4x-11)=7
then it becomes -6x-11=7
then -6x=18
then our answer, x=-3
Your equation:

Your goal is to get "x" by itself
So add 10 to each side like

which is now

Now divide the 20 by -5 which is -4
Answer: x=-4
If each target is -15 points, and he lost 75 points then you would divide -75 by -15 to get 5. Allen missed 5 targets.